<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .block{

    }
  </style>
</head>

<body>
  <!-- 
    2022年4月30日09:34:33
    css 1
    说说你对盒子模型的理解
   -->
  <div class="block">
    
  </div>
</body>

</html>
